Coauthored Publications with: Elsayed

Conference Paper

Elkotby H, Elsayed K, Ismail MH.  2012.  Exploiting Interference Alignment for Sum Rate Enhancement in D2D-Enabled Cellular Networks. Proc. of the IEEE Wireless Communications and Networking Conference (WCNC 2012).
Abdelaal R, Ismail MH, Elsayed K.  2012.  Resource Allocation Strategies Based on the Signal-to-Leakage-plus-Noise Ratio in LTE-A CoMP Systems. Proc. of the IEEE Wireless Communications and Networking Conference (WCNC 2012).
Elgendy OA, Ismail MH, Elsayed K.  2012.  On the Relay Placement Problem in a Multi-cell LTE-Advanced System with Co-channel Interference. Proc. of the 8th IEEE Int.Conf on Wireless and Mobile Computing, Networking and Communications (WiMob 2012). Abstract

One of the main problems in LTE-A networks is the small rates achieved by cell-edge users. This is due to the adoption of a frequency reuse factor of 1, which aims at increasing the overall capacity. This occurs, however, at the expense of increasing the interference level for cell-edge users. Cooperative communication through the use of relays is an efficient technique to solve this problem. However, careful placement of the relays is a crucial factor in determining the expected capacity gain. In this paper, the relay placement problem in an LTE-A network is studied, taking into consideration the effect of co-channel interference. An optimization framework is proposed to maximize either the total cell capacity or the total cell-edge capacity. Simulation results show a capacity gain factor of 8.027 for cell-edge users due to relay deployment, under 100% cell load in center cell and adjacent cells.
Elgendy OA, Ismail MH, Elsayed K.  2014.  Max-Min Fair Resource Allocation for LTE-Advanced Relay-Enhanced Cells. in Proc. IEEE Wireless Communications and Networking Conference (WCNC).
Abdelaal R, Elsayed K, Ismail MH.  2012.  Cooperative Scheduling, Precoding, and Optimized Power Allocation for LTE-Advanced CoMP Systems. Wireless Days.
Elkotby H, Elsayed K, Ismail MH.  2012.  Shrinking the Reuse Distance: Spectrally-Efficient Radio Resource Management in D2D-Enabled Cellular Networks with Interference Alignment. Wireless Days. Abstract

Enabling underlay direct Device-to-Device (D2D) communication mode in future cellular networks has good potential for spectrally-efficient and low-latency support of local media services. Recently, it has become evident that shrinking the reuse distance over which wireless resources are reused is a key enabler for achieving high spectral efficiency. Moreover, Interference Alignment (IA) based transmission can enhance the capacity of a wireless network by providing more degrees of freedom. In this work, we exploit clustering of D2D users, frequency reuse over clusters and then using IA to enhance the sum rate. Specifically, we show that in a D2D environment, it is possible to achieve significant gains in attainable rates by constructing clusters of D2D pairs and reuse the available radio resources over the clusters. Moreover, within a cluster, it is possible to further enhance the spectral efficiency by constructing small-sized groups of D2D pairs over which IA is applied to offer additional degrees of freedom. We show that resource reuse over the clusters offer overall rate increase proportional to the number of formed clusters. In addition, interference alignment offers up to 33% increase in the overall rates in the high transmission power regimes compared to the normal Point-to-Point (P2P) communication.

Journal Article

Elgendy O, Ismail MH, Elsayed K.  2018.  Radio Resource Management for LTE-A Relay-Enhanced Cells with Spatial Reuse and Max-Min Fairness. Telecommunication Systems. 68(4):643–655.
Abdelaal RA, Elsayed K, Ismail MH.  2015.  Optimized Joint Power and Resource Allocation for Coordinated Multi-Point Transmission for Multi-User LTE Advanced Systems. Wireless Personal Communications. 83(4):2497-2518.
Abdelaal RA, Elsayed K, Ismail MH.  2014.  Joint Scheduling and Resource Allocation with Fairness Based on the Signal-to-Leakage-plus-Noise Ratio in the Downlink of CoMP Systems. Wireless Personal Communications. 75(4):1891–1913.
Samir A, Ibrahim AS, Ismail MH, ElHalawany BM, Elsayed M.  2024.  Outage Performance of RIS-Assisted AmBC-NOMA Cooperative V2I Communications. IEEE Open Journal of the Communications Society. 5:4371–4382.
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